This page has general information on X development, including how to get started.

A common misconception is that developers need to understand all of X to get started. This is not true, and even of the "core" developers, only few actually know all the pieces that put X together. The best way to get started is to simply pick a problem and give it a try.

There is also a new book in the Amazon Kindle format, Hands-on Projects for the Linux Graphics Subsystem. This includes a number of original projects on the X.Org implementation of the Linux graphics subsystem. The book is aimed for instructors, students and any other OS internals enthusiasts.

Documentation

X New Developer’s Guide: High level introduction to X and the surrounding graphics stack, and how to get started in developing for them.